Stability and energy confinement of highly elongated plasmas in TCV

F. Hofmann, R. Behn, S. Coda, T. P. Goodman, M. Henderson, P. Lavanchy, Ph Marmillod, Y. Martin, A. Martynov, J. Mlynar, J. M. Moret, A. Pochelon, H. Reimerdes, O. Sauter, S. Alberti, C. Angioni, K. Appert, J. Bakos, P. Blanchard, P. BosshardR. Chavan, I. Condrea, A. Degeling, B. P. Duval, D. Fasel, J. Y. Favez, A. Favre, I. Furno, P. Gomez, P. Gorgerat, J. P. Hogge, P. F. Isoz, B. Joye, I. Klimanov, J. B. Lister, X. Llobet, J. C. Magnin, A. Manini, B. Marlétaz, J. M. Mayor, P. Nikkola, P. J. Paris, A. Perez, Z. A. Pietrzyk, V. Piffl, R. A. Pitts, A. Scarabosio, E. Scavino, A. Sushkov, G. Tonetti, M. Q. Tran, H. Weisen, A. Zabolotsky

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The operating space of the TCV tokamak has been extended to higher elongation, κ = 2.8, and higher normalized current, IN = Ip/aB = 3.6 MA/mT, than were previously attainable. This has been achieved by optimizing the parameters of the vertical position control system and by optimizing the plasma shape. Experimental current and beta limits were found to be consistent with ideal MHD stability calculations, using measured plasma shapes and profiles. The sawtooth period was measured as a function of elongation and sawtooth oscillations are found to disappear, at high elongation, when the internal inductance drops below li ∼ 0.69. MHD events at high elongation have been analysed, using magnetic fluctuation measurements. The electron energy confinement time at high elongation, 2.2 <κ <2.7, shows a strong dependence on density and power flux through the plasma surface, but no statistically significant dependence on κ. Finally, we have applied off-axis, second harmonic, X-mode electron cyclotron resonance heating (ECRH) in order to flatten the current profile and improve vertical stability. This gave access to previously inaccessible domains in κ-IN space.

Original languageEnglish
JournalPlasma Physics and Controlled Fusion
Volume43
Issue number12A
Publication statusPublished - 2001

Fingerprint

Plasma confinement
elongation
Elongation
Plasmas
Magnetohydrodynamics
energy
Electron cyclotron resonance
Position control
profiles
electron cyclotron resonance
inductance
Inductance
electron energy
Fluxes
Control systems
harmonics
Heating
oscillations
heating
Electrons

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Condensed Matter Physics
  • Nuclear and High Energy Physics

Cite this

Hofmann, F., Behn, R., Coda, S., Goodman, T. P., Henderson, M., Lavanchy, P., ... Zabolotsky, A. (2001). Stability and energy confinement of highly elongated plasmas in TCV. Plasma Physics and Controlled Fusion, 43(12A).

Stability and energy confinement of highly elongated plasmas in TCV. / Hofmann, F.; Behn, R.; Coda, S.; Goodman, T. P.; Henderson, M.; Lavanchy, P.; Marmillod, Ph; Martin, Y.; Martynov, A.; Mlynar, J.; Moret, J. M.; Pochelon, A.; Reimerdes, H.; Sauter, O.; Alberti, S.; Angioni, C.; Appert, K.; Bakos, J.; Blanchard, P.; Bosshard, P.; Chavan, R.; Condrea, I.; Degeling, A.; Duval, B. P.; Fasel, D.; Favez, J. Y.; Favre, A.; Furno, I.; Gomez, P.; Gorgerat, P.; Hogge, J. P.; Isoz, P. F.; Joye, B.; Klimanov, I.; Lister, J. B.; Llobet, X.; Magnin, J. C.; Manini, A.; Marlétaz, B.; Mayor, J. M.; Nikkola, P.; Paris, P. J.; Perez, A.; Pietrzyk, Z. A.; Piffl, V.; Pitts, R. A.; Scarabosio, A.; Scavino, E.; Sushkov, A.; Tonetti, G.; Tran, M. Q.; Weisen, H.; Zabolotsky, A.

In: Plasma Physics and Controlled Fusion, Vol. 43, No. 12A, 2001.

Research output: Contribution to journalArticle

Hofmann, F, Behn, R, Coda, S, Goodman, TP, Henderson, M, Lavanchy, P, Marmillod, P, Martin, Y, Martynov, A, Mlynar, J, Moret, JM, Pochelon, A, Reimerdes, H, Sauter, O, Alberti, S, Angioni, C, Appert, K, Bakos, J, Blanchard, P, Bosshard, P, Chavan, R, Condrea, I, Degeling, A, Duval, BP, Fasel, D, Favez, JY, Favre, A, Furno, I, Gomez, P, Gorgerat, P, Hogge, JP, Isoz, PF, Joye, B, Klimanov, I, Lister, JB, Llobet, X, Magnin, JC, Manini, A, Marlétaz, B, Mayor, JM, Nikkola, P, Paris, PJ, Perez, A, Pietrzyk, ZA, Piffl, V, Pitts, RA, Scarabosio, A, Scavino, E, Sushkov, A, Tonetti, G, Tran, MQ, Weisen, H & Zabolotsky, A 2001, 'Stability and energy confinement of highly elongated plasmas in TCV', Plasma Physics and Controlled Fusion, vol. 43, no. 12A.
Hofmann F, Behn R, Coda S, Goodman TP, Henderson M, Lavanchy P et al. Stability and energy confinement of highly elongated plasmas in TCV. Plasma Physics and Controlled Fusion. 2001;43(12A).
Hofmann, F. ; Behn, R. ; Coda, S. ; Goodman, T. P. ; Henderson, M. ; Lavanchy, P. ; Marmillod, Ph ; Martin, Y. ; Martynov, A. ; Mlynar, J. ; Moret, J. M. ; Pochelon, A. ; Reimerdes, H. ; Sauter, O. ; Alberti, S. ; Angioni, C. ; Appert, K. ; Bakos, J. ; Blanchard, P. ; Bosshard, P. ; Chavan, R. ; Condrea, I. ; Degeling, A. ; Duval, B. P. ; Fasel, D. ; Favez, J. Y. ; Favre, A. ; Furno, I. ; Gomez, P. ; Gorgerat, P. ; Hogge, J. P. ; Isoz, P. F. ; Joye, B. ; Klimanov, I. ; Lister, J. B. ; Llobet, X. ; Magnin, J. C. ; Manini, A. ; Marlétaz, B. ; Mayor, J. M. ; Nikkola, P. ; Paris, P. J. ; Perez, A. ; Pietrzyk, Z. A. ; Piffl, V. ; Pitts, R. A. ; Scarabosio, A. ; Scavino, E. ; Sushkov, A. ; Tonetti, G. ; Tran, M. Q. ; Weisen, H. ; Zabolotsky, A. / Stability and energy confinement of highly elongated plasmas in TCV. In: Plasma Physics and Controlled Fusion. 2001 ; Vol. 43, No. 12A.
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abstract = "The operating space of the TCV tokamak has been extended to higher elongation, κ = 2.8, and higher normalized current, IN = Ip/aB = 3.6 MA/mT, than were previously attainable. This has been achieved by optimizing the parameters of the vertical position control system and by optimizing the plasma shape. Experimental current and beta limits were found to be consistent with ideal MHD stability calculations, using measured plasma shapes and profiles. The sawtooth period was measured as a function of elongation and sawtooth oscillations are found to disappear, at high elongation, when the internal inductance drops below li ∼ 0.69. MHD events at high elongation have been analysed, using magnetic fluctuation measurements. The electron energy confinement time at high elongation, 2.2 <κ <2.7, shows a strong dependence on density and power flux through the plasma surface, but no statistically significant dependence on κ. Finally, we have applied off-axis, second harmonic, X-mode electron cyclotron resonance heating (ECRH) in order to flatten the current profile and improve vertical stability. This gave access to previously inaccessible domains in κ-IN space.",
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T1 - Stability and energy confinement of highly elongated plasmas in TCV

AU - Hofmann, F.

AU - Behn, R.

AU - Coda, S.

AU - Goodman, T. P.

AU - Henderson, M.

AU - Lavanchy, P.

AU - Marmillod, Ph

AU - Martin, Y.

AU - Martynov, A.

AU - Mlynar, J.

AU - Moret, J. M.

AU - Pochelon, A.

AU - Reimerdes, H.

AU - Sauter, O.

AU - Alberti, S.

AU - Angioni, C.

AU - Appert, K.

AU - Bakos, J.

AU - Blanchard, P.

AU - Bosshard, P.

AU - Chavan, R.

AU - Condrea, I.

AU - Degeling, A.

AU - Duval, B. P.

AU - Fasel, D.

AU - Favez, J. Y.

AU - Favre, A.

AU - Furno, I.

AU - Gomez, P.

AU - Gorgerat, P.

AU - Hogge, J. P.

AU - Isoz, P. F.

AU - Joye, B.

AU - Klimanov, I.

AU - Lister, J. B.

AU - Llobet, X.

AU - Magnin, J. C.

AU - Manini, A.

AU - Marlétaz, B.

AU - Mayor, J. M.

AU - Nikkola, P.

AU - Paris, P. J.

AU - Perez, A.

AU - Pietrzyk, Z. A.

AU - Piffl, V.

AU - Pitts, R. A.

AU - Scarabosio, A.

AU - Scavino, E.

AU - Sushkov, A.

AU - Tonetti, G.

AU - Tran, M. Q.

AU - Weisen, H.

AU - Zabolotsky, A.

PY - 2001

Y1 - 2001

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